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annotate miscprog/pircksum2.c @ 215:d69f7512e3c1

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Pirelli: documented and verified the checksum scheme used for the factory block
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 25 Dec 2016 23:48:16 +0000
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215
d69f7512e3c1 Pirelli: documented and verified the checksum scheme used for the factory block
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program verifies the correctness of the understanding described in the
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3 * ../pirelli/flash2-chksum write-up.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/file.h>
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8 #include <sys/stat.h>
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9 #include <sys/mman.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <endian.h>
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13 #include <stdlib.h>
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14 #include <unistd.h>
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15
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16 char *image_filename;
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17 u_char *image_map, *endrec;
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18 unsigned imgsize, max_imgsize;
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19
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20 open_and_map_file()
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21 {
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22 int fd;
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23 struct stat st;
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24
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25 fd = open(image_filename, O_RDONLY);
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26 if (fd < 0) {
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27 perror(image_filename);
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28 exit(1);
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29 }
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30 fstat(fd, &st);
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31 if (!S_ISREG(st.st_mode)) {
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32 fprintf(stderr, "error: %s is not a regular file\n",
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33 image_filename);
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34 exit(1);
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35 }
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36 if (st.st_size != 0x10000 && st.st_size != 0x360000) {
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37 fprintf(stderr, "error: %s has an unexpected size\n",
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38 image_filename);
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39 exit(1);
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40 }
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41 max_imgsize = st.st_size - 12;
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42 image_map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
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43 if (image_map == MAP_FAILED) {
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44 perror("mmap");
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45 exit(1);
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46 }
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47 close(fd);
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48 endrec = image_map + max_imgsize;
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49 return 0;
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50 }
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51
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52 verify_chksum1()
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53 {
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54 uint16_t sum, ref;
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55 unsigned offset;
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56
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57 sum = 0;
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58 for (offset = 0; offset + 1 < imgsize; offset += 2)
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59 sum += le16toh(*(uint16_t *)(image_map + offset));
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60 if (imgsize & 1)
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61 sum += image_map[offset];
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62 ref = le16toh(*(uint16_t *)(endrec + 8));
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63 if (sum == ref) {
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64 printf("Checksum 1 matches (%04X)\n", sum);
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65 return 0;
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66 } else {
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67 printf("Checksum 1 FAILED: computed %04X, stored %04X\n",
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68 sum, ref);
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69 return 1;
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70 }
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71 }
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72
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73 verify_chksum2()
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74 {
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75 uint16_t sum, ref;
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76 unsigned offset;
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77
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78 sum = 0;
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79 for (offset = 0; offset < 10; offset += 2)
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80 sum += le16toh(*(uint16_t *)(endrec + offset));
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81 ref = le16toh(*(uint16_t *)(endrec + 10));
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82 if (sum == ref) {
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83 printf("Checksum 2 matches (%04X)\n", sum);
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84 return 0;
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85 } else {
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86 printf("Checksum 2 FAILED: computed %04X, stored %04X\n",
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87 sum, ref);
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88 return 1;
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89 }
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90 }
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91
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92 main(argc, argv)
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93 char **argv;
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94 {
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95 int stat1, stat2;
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96
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97 if (argc != 2) {
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98 fprintf(stderr, "usage: %s image-filename\n", argv[0]);
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99 exit(1);
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100 }
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101 image_filename = argv[1];
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102 open_and_map_file();
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103 if (le32toh(*(uint32_t *)endrec) != 0x12345678) {
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104 printf("Error: 0x12345678 signature missing\n");
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105 exit(1);
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106 }
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107 imgsize = le32toh(*(uint32_t *)(endrec + 4));
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108 if (imgsize < 1 || imgsize > max_imgsize) {
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109 printf("Error: bogus image size of 0x%x bytes\n", imgsize);
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110 exit(1);
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111 }
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112 printf("Image size: 0x%x bytes\n", imgsize);
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113 stat1 = verify_chksum1();
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114 stat2 = verify_chksum2();
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115 exit(stat1 || stat2);
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116 }